1112 lines
37 KiB
C
1112 lines
37 KiB
C
/*!
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\file gd32vf103_rcu.c
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\brief RCU driver
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\version 2019-6-5, V1.0.0, firmware for GD32VF103
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*/
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/*
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Copyright (c) 2019, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "gd32vf103_rcu.h"
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/* define clock source */
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#define SEL_IRC8M ((uint16_t)0U)
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#define SEL_HXTAL ((uint16_t)1U)
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#define SEL_PLL ((uint16_t)2U)
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/* define startup timeout count */
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#define OSC_STARTUP_TIMEOUT ((uint32_t)0xFFFFFU)
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#define LXTAL_STARTUP_TIMEOUT ((uint32_t)0x3FFFFFFU)
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/*!
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\brief deinitialize the RCU
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\param[in] none
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\param[out] none
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\retval none
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*/
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void rcu_deinit(void)
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{
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/* enable IRC8M */
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RCU_CTL |= RCU_CTL_IRC8MEN;
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rcu_osci_stab_wait(RCU_IRC8M);
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/* reset CFG0 register */
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RCU_CFG0 &= ~(RCU_CFG0_SCS | RCU_CFG0_AHBPSC | RCU_CFG0_APB1PSC | RCU_CFG0_APB2PSC |
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RCU_CFG0_ADCPSC | RCU_CFG0_PLLSEL | RCU_CFG0_PREDV0_LSB | RCU_CFG0_PLLMF |
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RCU_CFG0_USBFSPSC | RCU_CFG0_CKOUT0SEL | RCU_CFG0_ADCPSC_2 | RCU_CFG0_PLLMF_4);
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/* reset CTL register */
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RCU_CTL &= ~(RCU_CTL_HXTALEN | RCU_CTL_CKMEN | RCU_CTL_PLLEN);
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RCU_CTL &= ~RCU_CTL_HXTALBPS;
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RCU_CTL &= ~(RCU_CTL_PLL1EN | RCU_CTL_PLL2EN);
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/* reset INT and CFG1 register */
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RCU_INT = 0x00ff0000U;
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RCU_CFG1 &= ~(RCU_CFG1_PREDV0 | RCU_CFG1_PREDV1 | RCU_CFG1_PLL1MF | RCU_CFG1_PLL2MF |
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RCU_CFG1_PREDV0SEL | RCU_CFG1_I2S1SEL | RCU_CFG1_I2S2SEL);
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}
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/*!
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\brief enable the peripherals clock
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\param[in] periph: RCU peripherals, refer to rcu_periph_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_GPIOx (x=A,B,C,D,E): GPIO ports clock
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\arg RCU_AF : alternate function clock
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\arg RCU_CRC: CRC clock
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\arg RCU_DMAx (x=0,1): DMA clock
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\arg RCU_USBFS: USBFS clock
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\arg RCU_EXMC: EXMC clock
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\arg RCU_TIMERx (x=0,1,2,3,4,5,6): TIMER clock
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\arg RCU_WWDGT: WWDGT clock
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\arg RCU_SPIx (x=0,1,2): SPI clock
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\arg RCU_USARTx (x=0,1,2): USART clock
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\arg RCU_UARTx (x=3,4): UART clock
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\arg RCU_I2Cx (x=0,1): I2C clock
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\arg RCU_CANx (x=0,1): CAN clock
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\arg RCU_PMU: PMU clock
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\arg RCU_DAC: DAC clock
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\arg RCU_RTC: RTC clock
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\arg RCU_ADCx (x=0,1): ADC clock
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\arg RCU_BKPI: BKP interface clock
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\param[out] none
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\retval none
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*/
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void rcu_periph_clock_enable(rcu_periph_enum periph)
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{
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RCU_REG_VAL(periph) |= BIT(RCU_BIT_POS(periph));
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}
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/*!
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\brief disable the peripherals clock
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\param[in] periph: RCU peripherals, refer to rcu_periph_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_GPIOx (x=A,B,C,D,E): GPIO ports clock
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\arg RCU_AF: alternate function clock
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\arg RCU_CRC: CRC clock
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\arg RCU_DMAx (x=0,1): DMA clock
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\arg RCU_USBFS: USBFS clock
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\arg RCU_EXMC: EXMC clock
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\arg RCU_TIMERx (x=0,1,2,3,4,5,6): TIMER clock
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\arg RCU_WWDGT: WWDGT clock
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\arg RCU_SPIx (x=0,1,2): SPI clock
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\arg RCU_USARTx (x=0,1,2): USART clock
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\arg RCU_UARTx (x=3,4): UART clock
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\arg RCU_I2Cx (x=0,1): I2C clock
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\arg RCU_CANx (x=0,1): CAN clock
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\arg RCU_PMU: PMU clock
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\arg RCU_DAC: DAC clock
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\arg RCU_RTC: RTC clock
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\arg RCU_ADCx (x=0,1): ADC clock
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\arg RCU_BKPI: BKP interface clock
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\param[out] none
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\retval none
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*/
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void rcu_periph_clock_disable(rcu_periph_enum periph)
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{
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RCU_REG_VAL(periph) &= ~BIT(RCU_BIT_POS(periph));
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}
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/*!
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\brief enable the peripherals clock when sleep mode
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\param[in] periph: RCU peripherals, refer to rcu_periph_sleep_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_FMC_SLP: FMC clock
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\arg RCU_SRAM_SLP: SRAM clock
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\param[out] none
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\retval none
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*/
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void rcu_periph_clock_sleep_enable(rcu_periph_sleep_enum periph)
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{
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RCU_REG_VAL(periph) |= BIT(RCU_BIT_POS(periph));
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}
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/*!
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\brief disable the peripherals clock when sleep mode
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\param[in] periph: RCU peripherals, refer to rcu_periph_sleep_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_FMC_SLP: FMC clock
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\arg RCU_SRAM_SLP: SRAM clock
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\param[out] none
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\retval none
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*/
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void rcu_periph_clock_sleep_disable(rcu_periph_sleep_enum periph)
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{
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RCU_REG_VAL(periph) &= ~BIT(RCU_BIT_POS(periph));
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}
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/*!
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\brief reset the peripherals
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\param[in] periph_reset: RCU peripherals reset, refer to rcu_periph_reset_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_GPIOxRST (x=A,B,C,D,E): reset GPIO ports
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\arg RCU_AFRST : reset alternate function clock
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\arg RCU_USBFSRST: reset USBFS
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\arg RCU_TIMERxRST (x=0,1,2,3,4,5,6): reset TIMER
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\arg RCU_WWDGTRST: reset WWDGT
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\arg RCU_SPIxRST (x=0,1,2): reset SPI
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\arg RCU_USARTxRST (x=0,1,2): reset USART
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\arg RCU_UARTxRST (x=3,4): reset UART
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\arg RCU_I2CxRST (x=0,1): reset I2C
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\arg RCU_CANxRST (x=0,1): reset CAN
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\arg RCU_PMURST: reset PMU
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\arg RCU_DACRST: reset DAC
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\arg RCU_ADCxRST (x=0,1): reset ADC
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\arg RCU_BKPIRST: reset BKPI
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\param[out] none
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\retval none
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*/
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void rcu_periph_reset_enable(rcu_periph_reset_enum periph_reset)
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{
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RCU_REG_VAL(periph_reset) |= BIT(RCU_BIT_POS(periph_reset));
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}
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/*!
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\brief disable reset the peripheral
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\param[in] periph_reset: RCU peripherals reset, refer to rcu_periph_reset_enum
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only one parameter can be selected which is shown as below:
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\arg RCU_GPIOxRST (x=A,B,C,D,E): reset GPIO ports
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\arg RCU_AFRST : reset alternate function clock
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\arg RCU_USBFSRST: reset USBFS
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\arg RCU_TIMERxRST (x=0,1,2,3,4,5,6): reset TIMER
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\arg RCU_WWDGTRST: reset WWDGT
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\arg RCU_SPIxRST (x=0,1,2): reset SPI
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\arg RCU_USARTxRST (x=0,1,2): reset USART
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\arg RCU_UARTxRST (x=3,4): reset UART
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\arg RCU_I2CxRST (x=0,1): reset I2C
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\arg RCU_CANxRST (x=0,1): reset CAN
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\arg RCU_PMURST: reset PMU
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\arg RCU_DACRST: reset DAC
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\arg RCU_ADCxRST (x=0,1): reset ADC
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\arg RCU_BKPIRST: reset BKPI
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\param[out] none
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\retval none
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*/
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void rcu_periph_reset_disable(rcu_periph_reset_enum periph_reset)
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{
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RCU_REG_VAL(periph_reset) &= ~BIT(RCU_BIT_POS(periph_reset));
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}
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/*!
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\brief reset the BKP domain
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\param[in] none
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\param[out] none
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\retval none
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*/
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void rcu_bkp_reset_enable(void)
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{
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RCU_BDCTL |= RCU_BDCTL_BKPRST;
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}
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/*!
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\brief disable the BKP domain reset
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\param[in] none
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\param[out] none
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\retval none
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*/
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void rcu_bkp_reset_disable(void)
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{
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RCU_BDCTL &= ~RCU_BDCTL_BKPRST;
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}
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/*!
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\brief configure the system clock source
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\param[in] ck_sys: system clock source select
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only one parameter can be selected which is shown as below:
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\arg RCU_CKSYSSRC_IRC8M: select CK_IRC8M as the CK_SYS source
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\arg RCU_CKSYSSRC_HXTAL: select CK_HXTAL as the CK_SYS source
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\arg RCU_CKSYSSRC_PLL: select CK_PLL as the CK_SYS source
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\param[out] none
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\retval none
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*/
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void rcu_system_clock_source_config(uint32_t ck_sys)
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{
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uint32_t reg;
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reg = RCU_CFG0;
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/* reset the SCS bits and set according to ck_sys */
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reg &= ~RCU_CFG0_SCS;
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RCU_CFG0 = (reg | ck_sys);
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}
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/*!
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\brief get the system clock source
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\param[in] none
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\param[out] none
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\retval which clock is selected as CK_SYS source
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\arg RCU_SCSS_IRC8M: CK_IRC8M is selected as the CK_SYS source
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\arg RCU_SCSS_HXTAL: CK_HXTAL is selected as the CK_SYS source
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\arg RCU_SCSS_PLL: CK_PLL is selected as the CK_SYS source
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*/
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uint32_t rcu_system_clock_source_get(void)
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{
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return (RCU_CFG0 & RCU_CFG0_SCSS);
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}
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/*!
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\brief configure the AHB clock prescaler selection
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\param[in] ck_ahb: AHB clock prescaler selection
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only one parameter can be selected which is shown as below:
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\arg RCU_AHB_CKSYS_DIVx, x=1, 2, 4, 8, 16, 64, 128, 256, 512
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\param[out] none
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\retval none
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*/
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void rcu_ahb_clock_config(uint32_t ck_ahb)
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{
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uint32_t reg;
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reg = RCU_CFG0;
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/* reset the AHBPSC bits and set according to ck_ahb */
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reg &= ~RCU_CFG0_AHBPSC;
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RCU_CFG0 = (reg | ck_ahb);
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}
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/*!
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\brief configure the APB1 clock prescaler selection
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\param[in] ck_apb1: APB1 clock prescaler selection
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only one parameter can be selected which is shown as below:
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\arg RCU_APB1_CKAHB_DIV1: select CK_AHB as CK_APB1
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\arg RCU_APB1_CKAHB_DIV2: select CK_AHB/2 as CK_APB1
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\arg RCU_APB1_CKAHB_DIV4: select CK_AHB/4 as CK_APB1
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\arg RCU_APB1_CKAHB_DIV8: select CK_AHB/8 as CK_APB1
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\arg RCU_APB1_CKAHB_DIV16: select CK_AHB/16 as CK_APB1
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\param[out] none
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\retval none
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*/
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void rcu_apb1_clock_config(uint32_t ck_apb1)
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{
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uint32_t reg;
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reg = RCU_CFG0;
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/* reset the APB1PSC and set according to ck_apb1 */
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reg &= ~RCU_CFG0_APB1PSC;
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RCU_CFG0 = (reg | ck_apb1);
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}
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/*!
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\brief configure the APB2 clock prescaler selection
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\param[in] ck_apb2: APB2 clock prescaler selection
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only one parameter can be selected which is shown as below:
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\arg RCU_APB2_CKAHB_DIV1: select CK_AHB as CK_APB2
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\arg RCU_APB2_CKAHB_DIV2: select CK_AHB/2 as CK_APB2
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\arg RCU_APB2_CKAHB_DIV4: select CK_AHB/4 as CK_APB2
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\arg RCU_APB2_CKAHB_DIV8: select CK_AHB/8 as CK_APB2
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\arg RCU_APB2_CKAHB_DIV16: select CK_AHB/16 as CK_APB2
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\param[out] none
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\retval none
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*/
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void rcu_apb2_clock_config(uint32_t ck_apb2)
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{
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uint32_t reg;
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reg = RCU_CFG0;
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/* reset the APB2PSC and set according to ck_apb2 */
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reg &= ~RCU_CFG0_APB2PSC;
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RCU_CFG0 = (reg | ck_apb2);
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}
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/*!
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\brief configure the CK_OUT0 clock source
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\param[in] ckout0_src: CK_OUT0 clock source selection
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only one parameter can be selected which is shown as below:
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\arg RCU_CKOUT0SRC_NONE: no clock selected
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\arg RCU_CKOUT0SRC_CKSYS: system clock selected
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\arg RCU_CKOUT0SRC_IRC8M: high speed 8M internal oscillator clock selected
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\arg RCU_CKOUT0SRC_HXTAL: HXTAL selected
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\arg RCU_CKOUT0SRC_CKPLL_DIV2: CK_PLL/2 selected
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\arg RCU_CKOUT0SRC_CKPLL1: CK_PLL1 selected
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\arg RCU_CKOUT0SRC_CKPLL2_DIV2: CK_PLL2/2 selected
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\arg RCU_CKOUT0SRC_EXT1: EXT1 selected
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\arg RCU_CKOUT0SRC_CKPLL2: PLL2 selected
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\param[out] none
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\retval none
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*/
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void rcu_ckout0_config(uint32_t ckout0_src)
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{
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uint32_t reg;
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reg = RCU_CFG0;
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/* reset the CKOUT0SRC, set according to ckout0_src */
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reg &= ~RCU_CFG0_CKOUT0SEL;
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RCU_CFG0 = (reg | ckout0_src);
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}
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/*!
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\brief configure the main PLL clock
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\param[in] pll_src: PLL clock source selection
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only one parameter can be selected which is shown as below:
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\arg RCU_PLLSRC_IRC8M_DIV2: IRC8M/2 clock selected as source clock of PLL
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\arg RCU_PLLSRC_HXTAL: HXTAL selected as source clock of PLL
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\param[in] pll_mul: PLL clock multiplication factor
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only one parameter can be selected which is shown as below:
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\arg RCU_PLL_MULx (x = 2..14, 6.5, 16..32)
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\param[out] none
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\retval none
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*/
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void rcu_pll_config(uint32_t pll_src, uint32_t pll_mul)
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{
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uint32_t reg = 0U;
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reg = RCU_CFG0;
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/* PLL clock source and multiplication factor configuration */
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reg &= ~(RCU_CFG0_PLLSEL | RCU_CFG0_PLLMF | RCU_CFG0_PLLMF_4);
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reg |= (pll_src | pll_mul);
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RCU_CFG0 = reg;
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}
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/*!
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\brief configure the PREDV0 division factor and clock source
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\param[in] predv0_source: PREDV0 input clock source selection
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only one parameter can be selected which is shown as below:
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\arg RCU_PREDV0SRC_HXTAL: HXTAL selected as PREDV0 input source clock
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\arg RCU_PREDV0SRC_CKPLL1: CK_PLL1 selected as PREDV0 input source clock
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\param[in] predv0_div: PREDV0 division factor
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only one parameter can be selected which is shown as below:
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\arg RCU_PREDV0_DIVx, x = 1..16
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\param[out] none
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\retval none
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*/
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void rcu_predv0_config(uint32_t predv0_source, uint32_t predv0_div)
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{
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uint32_t reg = 0U;
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reg = RCU_CFG1;
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/* reset PREDV0SEL and PREDV0 bits */
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reg &= ~(RCU_CFG1_PREDV0SEL | RCU_CFG1_PREDV0);
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/* set the PREDV0SEL and PREDV0 division factor */
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reg |= (predv0_source | predv0_div);
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RCU_CFG1 = reg;
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}
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/*!
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\brief configure the PREDV1 division factor
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\param[in] predv1_div: PREDV1 division factor
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only one parameter can be selected which is shown as below:
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\arg RCU_PREDV1_DIVx, x = 1..16
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\param[out] none
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\retval none
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*/
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void rcu_predv1_config(uint32_t predv1_div)
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{
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uint32_t reg = 0U;
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reg = RCU_CFG1;
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/* reset the PREDV1 bits */
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reg &= ~RCU_CFG1_PREDV1;
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/* set the PREDV1 division factor */
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reg |= predv1_div;
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RCU_CFG1 = reg;
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}
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/*!
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\brief configure the PLL1 clock
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|
\param[in] pll_mul: PLL clock multiplication factor
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_PLL1_MULx (x = 8..16, 20)
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_pll1_config(uint32_t pll_mul)
|
|
{
|
|
RCU_CFG1 &= ~RCU_CFG1_PLL1MF;
|
|
RCU_CFG1 |= pll_mul;
|
|
}
|
|
|
|
/*!
|
|
\brief configure the PLL2 clock
|
|
\param[in] pll_mul: PLL clock multiplication factor
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_PLL2_MULx (x = 8..16, 20)
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_pll2_config(uint32_t pll_mul)
|
|
{
|
|
RCU_CFG1 &= ~RCU_CFG1_PLL2MF;
|
|
RCU_CFG1 |= pll_mul;
|
|
}
|
|
|
|
/*!
|
|
\brief configure the ADC prescaler factor
|
|
\param[in] adc_psc: ADC prescaler factor
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_CKADC_CKAPB2_DIV2: ADC prescaler select CK_APB2/2
|
|
\arg RCU_CKADC_CKAPB2_DIV4: ADC prescaler select CK_APB2/4
|
|
\arg RCU_CKADC_CKAPB2_DIV6: ADC prescaler select CK_APB2/6
|
|
\arg RCU_CKADC_CKAPB2_DIV8: ADC prescaler select CK_APB2/8
|
|
\arg RCU_CKADC_CKAPB2_DIV12: ADC prescaler select CK_APB2/12
|
|
\arg RCU_CKADC_CKAPB2_DIV16: ADC prescaler select CK_APB2/16
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_adc_clock_config(uint32_t adc_psc)
|
|
{
|
|
uint32_t reg0;
|
|
|
|
/* reset the ADCPSC bits */
|
|
reg0 = RCU_CFG0;
|
|
reg0 &= ~(RCU_CFG0_ADCPSC_2 | RCU_CFG0_ADCPSC);
|
|
|
|
/* set the ADC prescaler factor */
|
|
switch(adc_psc){
|
|
case RCU_CKADC_CKAPB2_DIV2:
|
|
case RCU_CKADC_CKAPB2_DIV4:
|
|
case RCU_CKADC_CKAPB2_DIV6:
|
|
case RCU_CKADC_CKAPB2_DIV8:
|
|
reg0 |= (adc_psc << 14);
|
|
break;
|
|
|
|
case RCU_CKADC_CKAPB2_DIV12:
|
|
case RCU_CKADC_CKAPB2_DIV16:
|
|
adc_psc &= ~BIT(2);
|
|
reg0 |= (adc_psc << 14 | RCU_CFG0_ADCPSC_2);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* set the register */
|
|
RCU_CFG0 = reg0;
|
|
}
|
|
|
|
/*!
|
|
\brief configure the USBFS prescaler factor
|
|
\param[in] usb_psc: USB prescaler factor
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_CKUSB_CKPLL_DIV1_5: USBFS prescaler select CK_PLL/1.5
|
|
\arg RCU_CKUSB_CKPLL_DIV1: USBFS prescaler select CK_PLL/1
|
|
\arg RCU_CKUSB_CKPLL_DIV2_5: USBFS prescaler select CK_PLL/2.5
|
|
\arg RCU_CKUSB_CKPLL_DIV2: USBFS prescaler select CK_PLL/2
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_usb_clock_config(uint32_t usb_psc)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = RCU_CFG0;
|
|
|
|
/* configure the USBFS prescaler factor */
|
|
reg &= ~RCU_CFG0_USBFSPSC;
|
|
RCU_CFG0 = (reg | usb_psc);
|
|
}
|
|
|
|
/*!
|
|
\brief configure the RTC clock source selection
|
|
\param[in] rtc_clock_source: RTC clock source selection
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_RTCSRC_NONE: no clock selected
|
|
\arg RCU_RTCSRC_LXTAL: CK_LXTAL selected as RTC source clock
|
|
\arg RCU_RTCSRC_IRC40K: CK_IRC40K selected as RTC source clock
|
|
\arg RCU_RTCSRC_HXTAL_DIV_128: CK_HXTAL/128 selected as RTC source clock
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_rtc_clock_config(uint32_t rtc_clock_source)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = RCU_BDCTL;
|
|
/* reset the RTCSRC bits and set according to rtc_clock_source */
|
|
reg &= ~RCU_BDCTL_RTCSRC;
|
|
RCU_BDCTL = (reg | rtc_clock_source);
|
|
}
|
|
|
|
/*!
|
|
\brief configure the I2S1 clock source selection
|
|
\param[in] i2s_clock_source: I2S1 clock source selection
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_I2S1SRC_CKSYS: System clock selected as I2S1 source clock
|
|
\arg RCU_I2S1SRC_CKPLL2_MUL2: CK_PLL2x2 selected as I2S1 source clock
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_i2s1_clock_config(uint32_t i2s_clock_source)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = RCU_CFG1;
|
|
/* reset the I2S1SEL bit and set according to i2s_clock_source */
|
|
reg &= ~RCU_CFG1_I2S1SEL;
|
|
RCU_CFG1 = (reg | i2s_clock_source);
|
|
}
|
|
|
|
/*!
|
|
\brief configure the I2S2 clock source selection
|
|
\param[in] i2s_clock_source: I2S2 clock source selection
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_I2S2SRC_CKSYS: system clock selected as I2S2 source clock
|
|
\arg RCU_I2S2SRC_CKPLL2_MUL2: CK_PLL2x2 selected as I2S2 source clock
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_i2s2_clock_config(uint32_t i2s_clock_source)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = RCU_CFG1;
|
|
/* reset the I2S2SEL bit and set according to i2s_clock_source */
|
|
reg &= ~RCU_CFG1_I2S2SEL;
|
|
RCU_CFG1 = (reg | i2s_clock_source);
|
|
}
|
|
|
|
/*!
|
|
\brief get the clock stabilization and periphral reset flags
|
|
\param[in] flag: the clock stabilization and periphral reset flags, refer to rcu_flag_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_FLAG_IRC8MSTB: IRC8M stabilization flag
|
|
\arg RCU_FLAG_HXTALSTB: HXTAL stabilization flag
|
|
\arg RCU_FLAG_PLLSTB: PLL stabilization flag
|
|
\arg RCU_FLAG_PLL1STB: PLL1 stabilization flag
|
|
\arg RCU_FLAG_PLL2STB: PLL2 stabilization flag
|
|
\arg RCU_FLAG_LXTALSTB: LXTAL stabilization flag
|
|
\arg RCU_FLAG_IRC40KSTB: IRC40K stabilization flag
|
|
\arg RCU_FLAG_EPRST: external PIN reset flag
|
|
\arg RCU_FLAG_PORRST: power reset flag
|
|
\arg RCU_FLAG_SWRST: software reset flag
|
|
\arg RCU_FLAG_FWDGTRST: free watchdog timer reset flag
|
|
\arg RCU_FLAG_WWDGTRST: window watchdog timer reset flag
|
|
\arg RCU_FLAG_LPRST: low-power reset flag
|
|
\param[out] none
|
|
\retval FlagStatus: SET or RESET
|
|
*/
|
|
FlagStatus rcu_flag_get(rcu_flag_enum flag)
|
|
{
|
|
/* get the rcu flag */
|
|
if(RESET != (RCU_REG_VAL(flag) & BIT(RCU_BIT_POS(flag)))){
|
|
return SET;
|
|
}else{
|
|
return RESET;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief clear all the reset flag
|
|
\param[in] none
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_all_reset_flag_clear(void)
|
|
{
|
|
RCU_RSTSCK |= RCU_RSTSCK_RSTFC;
|
|
}
|
|
|
|
/*!
|
|
\brief get the clock stabilization interrupt and ckm flags
|
|
\param[in] int_flag: interrupt and ckm flags, refer to rcu_int_flag_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_INT_FLAG_IRC40KSTB: IRC40K stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_LXTALSTB: LXTAL stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_IRC8MSTB: IRC8M stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_HXTALSTB: HXTAL stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_PLLSTB: PLL stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_PLL1STB: PLL1 stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_PLL2STB: PLL2 stabilization interrupt flag
|
|
\arg RCU_INT_FLAG_CKM: HXTAL clock stuck interrupt flag
|
|
\param[out] none
|
|
\retval FlagStatus: SET or RESET
|
|
*/
|
|
FlagStatus rcu_interrupt_flag_get(rcu_int_flag_enum int_flag)
|
|
{
|
|
/* get the rcu interrupt flag */
|
|
if(RESET != (RCU_REG_VAL(int_flag) & BIT(RCU_BIT_POS(int_flag)))){
|
|
return SET;
|
|
}else{
|
|
return RESET;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief clear the interrupt flags
|
|
\param[in] int_flag_clear: clock stabilization and stuck interrupt flags clear, refer to rcu_int_flag_clear_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_INT_FLAG_IRC40KSTB_CLR: IRC40K stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_LXTALSTB_CLR: LXTAL stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_IRC8MSTB_CLR: IRC8M stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_HXTALSTB_CLR: HXTAL stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_PLLSTB_CLR: PLL stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_PLL1STB_CLR: PLL1 stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_PLL2STB_CLR: PLL2 stabilization interrupt flag clear
|
|
\arg RCU_INT_FLAG_CKM_CLR: clock stuck interrupt flag clear
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_interrupt_flag_clear(rcu_int_flag_clear_enum int_flag_clear)
|
|
{
|
|
RCU_REG_VAL(int_flag_clear) |= BIT(RCU_BIT_POS(int_flag_clear));
|
|
}
|
|
|
|
/*!
|
|
\brief enable the stabilization interrupt
|
|
\param[in] stab_int: clock stabilization interrupt, refer to rcu_int_enum
|
|
Only one parameter can be selected which is shown as below:
|
|
\arg RCU_INT_IRC40KSTB: IRC40K stabilization interrupt enable
|
|
\arg RCU_INT_LXTALSTB: LXTAL stabilization interrupt enable
|
|
\arg RCU_INT_IRC8MSTB: IRC8M stabilization interrupt enable
|
|
\arg RCU_INT_HXTALSTB: HXTAL stabilization interrupt enable
|
|
\arg RCU_INT_PLLSTB: PLL stabilization interrupt enable
|
|
\arg RCU_INT_PLL1STB: PLL1 stabilization interrupt enable
|
|
\arg RCU_INT_PLL2STB: PLL2 stabilization interrupt enable
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_interrupt_enable(rcu_int_enum stab_int)
|
|
{
|
|
RCU_REG_VAL(stab_int) |= BIT(RCU_BIT_POS(stab_int));
|
|
}
|
|
|
|
/*!
|
|
\brief disable the stabilization interrupt
|
|
\param[in] stab_int: clock stabilization interrupt, refer to rcu_int_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_INT_IRC40KSTB: IRC40K stabilization interrupt enable
|
|
\arg RCU_INT_LXTALSTB: LXTAL stabilization interrupt enable
|
|
\arg RCU_INT_IRC8MSTB: IRC8M stabilization interrupt enable
|
|
\arg RCU_INT_HXTALSTB: HXTAL stabilization interrupt enable
|
|
\arg RCU_INT_PLLSTB: PLL stabilization interrupt enable
|
|
\arg RCU_INT_PLL1STB: PLL1 stabilization interrupt enable
|
|
\arg RCU_INT_PLL2STB: PLL2 stabilization interrupt enable
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_interrupt_disable(rcu_int_enum stab_int)
|
|
{
|
|
RCU_REG_VAL(stab_int) &= ~BIT(RCU_BIT_POS(stab_int));
|
|
}
|
|
|
|
/*!
|
|
\brief wait for oscillator stabilization flags is SET or oscillator startup is timeout
|
|
\param[in] osci: oscillator types, refer to rcu_osci_type_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_HXTAL: high speed crystal oscillator(HXTAL)
|
|
\arg RCU_LXTAL: low speed crystal oscillator(LXTAL)
|
|
\arg RCU_IRC8M: internal 8M RC oscillators(IRC8M)
|
|
\arg RCU_IRC40K: internal 40K RC oscillator(IRC40K)
|
|
\arg RCU_PLL_CK: phase locked loop(PLL)
|
|
\arg RCU_PLL1_CK: phase locked loop 1
|
|
\arg RCU_PLL2_CK: phase locked loop 2
|
|
\param[out] none
|
|
\retval ErrStatus: SUCCESS or ERROR
|
|
*/
|
|
ErrStatus rcu_osci_stab_wait(rcu_osci_type_enum osci)
|
|
{
|
|
uint32_t stb_cnt = 0U;
|
|
ErrStatus reval = ERROR;
|
|
FlagStatus osci_stat = RESET;
|
|
|
|
switch(osci){
|
|
/* wait HXTAL stable */
|
|
case RCU_HXTAL:
|
|
while((RESET == osci_stat) && (HXTAL_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_HXTALSTB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_HXTALSTB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
|
|
/* wait LXTAL stable */
|
|
case RCU_LXTAL:
|
|
while((RESET == osci_stat) && (LXTAL_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_LXTALSTB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_LXTALSTB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
|
|
/* wait IRC8M stable */
|
|
case RCU_IRC8M:
|
|
while((RESET == osci_stat) && (IRC8M_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_IRC8MSTB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_IRC8MSTB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
|
|
/* wait IRC40K stable */
|
|
case RCU_IRC40K:
|
|
while((RESET == osci_stat) && (OSC_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_IRC40KSTB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_IRC40KSTB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
|
|
/* wait PLL stable */
|
|
case RCU_PLL_CK:
|
|
while((RESET == osci_stat) && (OSC_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_PLLSTB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_PLLSTB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
/* wait PLL1 stable */
|
|
case RCU_PLL1_CK:
|
|
while((RESET == osci_stat) && (OSC_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_PLL1STB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_PLL1STB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
/* wait PLL2 stable */
|
|
case RCU_PLL2_CK:
|
|
while((RESET == osci_stat) && (OSC_STARTUP_TIMEOUT != stb_cnt)){
|
|
osci_stat = rcu_flag_get(RCU_FLAG_PLL2STB);
|
|
stb_cnt++;
|
|
}
|
|
|
|
/* check whether flag is set or not */
|
|
if(RESET != rcu_flag_get(RCU_FLAG_PLL2STB)){
|
|
reval = SUCCESS;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* return value */
|
|
return reval;
|
|
}
|
|
|
|
/*!
|
|
\brief turn on the oscillator
|
|
\param[in] osci: oscillator types, refer to rcu_osci_type_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_HXTAL: high speed crystal oscillator(HXTAL)
|
|
\arg RCU_LXTAL: low speed crystal oscillator(LXTAL)
|
|
\arg RCU_IRC8M: internal 8M RC oscillators(IRC8M)
|
|
\arg RCU_IRC40K: internal 40K RC oscillator(IRC40K)
|
|
\arg RCU_PLL_CK: phase locked loop(PLL)
|
|
\arg RCU_PLL1_CK: phase locked loop 1
|
|
\arg RCU_PLL2_CK: phase locked loop 2
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_osci_on(rcu_osci_type_enum osci)
|
|
{
|
|
RCU_REG_VAL(osci) |= BIT(RCU_BIT_POS(osci));
|
|
}
|
|
|
|
/*!
|
|
\brief turn off the oscillator
|
|
\param[in] osci: oscillator types, refer to rcu_osci_type_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_HXTAL: high speed crystal oscillator(HXTAL)
|
|
\arg RCU_LXTAL: low speed crystal oscillator(LXTAL)
|
|
\arg RCU_IRC8M: internal 8M RC oscillators(IRC8M)
|
|
\arg RCU_IRC40K: internal 40K RC oscillator(IRC40K)
|
|
\arg RCU_PLL_CK: phase locked loop(PLL)
|
|
\arg RCU_PLL1_CK: phase locked loop 1
|
|
\arg RCU_PLL2_CK: phase locked loop 2
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_osci_off(rcu_osci_type_enum osci)
|
|
{
|
|
RCU_REG_VAL(osci) &= ~BIT(RCU_BIT_POS(osci));
|
|
}
|
|
|
|
/*!
|
|
\brief enable the oscillator bypass mode, HXTALEN or LXTALEN must be reset before it
|
|
\param[in] osci: oscillator types, refer to rcu_osci_type_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_HXTAL: high speed crystal oscillator(HXTAL)
|
|
\arg RCU_LXTAL: low speed crystal oscillator(LXTAL)
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_osci_bypass_mode_enable(rcu_osci_type_enum osci)
|
|
{
|
|
uint32_t reg;
|
|
|
|
switch(osci){
|
|
/* enable HXTAL to bypass mode */
|
|
case RCU_HXTAL:
|
|
reg = RCU_CTL;
|
|
RCU_CTL &= ~RCU_CTL_HXTALEN;
|
|
RCU_CTL = (reg | RCU_CTL_HXTALBPS);
|
|
break;
|
|
/* enable LXTAL to bypass mode */
|
|
case RCU_LXTAL:
|
|
reg = RCU_BDCTL;
|
|
RCU_BDCTL &= ~RCU_BDCTL_LXTALEN;
|
|
RCU_BDCTL = (reg | RCU_BDCTL_LXTALBPS);
|
|
break;
|
|
case RCU_IRC8M:
|
|
case RCU_IRC40K:
|
|
case RCU_PLL_CK:
|
|
case RCU_PLL1_CK:
|
|
case RCU_PLL2_CK:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief disable the oscillator bypass mode, HXTALEN or LXTALEN must be reset before it
|
|
\param[in] osci: oscillator types, refer to rcu_osci_type_enum
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_HXTAL: high speed crystal oscillator(HXTAL)
|
|
\arg RCU_LXTAL: low speed crystal oscillator(LXTAL)
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_osci_bypass_mode_disable(rcu_osci_type_enum osci)
|
|
{
|
|
uint32_t reg;
|
|
|
|
switch(osci){
|
|
/* disable HXTAL to bypass mode */
|
|
case RCU_HXTAL:
|
|
reg = RCU_CTL;
|
|
RCU_CTL &= ~RCU_CTL_HXTALEN;
|
|
RCU_CTL = (reg & ~RCU_CTL_HXTALBPS);
|
|
break;
|
|
/* disable LXTAL to bypass mode */
|
|
case RCU_LXTAL:
|
|
reg = RCU_BDCTL;
|
|
RCU_BDCTL &= ~RCU_BDCTL_LXTALEN;
|
|
RCU_BDCTL = (reg & ~RCU_BDCTL_LXTALBPS);
|
|
break;
|
|
case RCU_IRC8M:
|
|
case RCU_IRC40K:
|
|
case RCU_PLL_CK:
|
|
case RCU_PLL1_CK:
|
|
case RCU_PLL2_CK:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief enable the HXTAL clock monitor
|
|
\param[in] none
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
|
|
void rcu_hxtal_clock_monitor_enable(void)
|
|
{
|
|
RCU_CTL |= RCU_CTL_CKMEN;
|
|
}
|
|
|
|
/*!
|
|
\brief disable the HXTAL clock monitor
|
|
\param[in] none
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_hxtal_clock_monitor_disable(void)
|
|
{
|
|
RCU_CTL &= ~RCU_CTL_CKMEN;
|
|
}
|
|
|
|
/*!
|
|
\brief set the IRC8M adjust value
|
|
\param[in] irc8m_adjval: IRC8M adjust value, must be between 0 and 0x1F
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_irc8m_adjust_value_set(uint32_t irc8m_adjval)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = RCU_CTL;
|
|
/* reset the IRC8MADJ bits and set according to irc8m_adjval */
|
|
reg &= ~RCU_CTL_IRC8MADJ;
|
|
RCU_CTL = (reg | ((irc8m_adjval & 0x1FU) << 3));
|
|
}
|
|
|
|
/*!
|
|
\brief deep-sleep mode voltage select
|
|
\param[in] dsvol: deep sleep mode voltage
|
|
only one parameter can be selected which is shown as below:
|
|
\arg RCU_DEEPSLEEP_V_1_2: the core voltage is 1.2V
|
|
\arg RCU_DEEPSLEEP_V_1_1: the core voltage is 1.1V
|
|
\arg RCU_DEEPSLEEP_V_1_0: the core voltage is 1.0V
|
|
\arg RCU_DEEPSLEEP_V_0_9: the core voltage is 0.9V
|
|
\param[out] none
|
|
\retval none
|
|
*/
|
|
void rcu_deepsleep_voltage_set(uint32_t dsvol)
|
|
{
|
|
dsvol &= RCU_DSV_DSLPVS;
|
|
RCU_DSV = dsvol;
|
|
}
|
|
|
|
/*!
|
|
\brief get the system clock, bus and peripheral clock frequency
|
|
\param[in] clock: the clock frequency which to get
|
|
only one parameter can be selected which is shown as below:
|
|
\arg CK_SYS: system clock frequency
|
|
\arg CK_AHB: AHB clock frequency
|
|
\arg CK_APB1: APB1 clock frequency
|
|
\arg CK_APB2: APB2 clock frequency
|
|
\param[out] none
|
|
\retval clock frequency of system, AHB, APB1, APB2
|
|
*/
|
|
uint32_t rcu_clock_freq_get(rcu_clock_freq_enum clock)
|
|
{
|
|
uint32_t sws, ck_freq = 0U;
|
|
uint32_t cksys_freq, ahb_freq, apb1_freq, apb2_freq;
|
|
uint32_t pllsel, predv0sel, pllmf,ck_src, idx, clk_exp;
|
|
uint32_t predv0, predv1, pll1mf;
|
|
|
|
/* exponent of AHB, APB1 and APB2 clock divider */
|
|
uint8_t ahb_exp[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
|
|
uint8_t apb1_exp[8] = {0, 0, 0, 0, 1, 2, 3, 4};
|
|
uint8_t apb2_exp[8] = {0, 0, 0, 0, 1, 2, 3, 4};
|
|
|
|
sws = GET_BITS(RCU_CFG0, 2, 3);
|
|
switch(sws){
|
|
/* IRC8M is selected as CK_SYS */
|
|
case SEL_IRC8M:
|
|
cksys_freq = IRC8M_VALUE;
|
|
break;
|
|
/* HXTAL is selected as CK_SYS */
|
|
case SEL_HXTAL:
|
|
cksys_freq = HXTAL_VALUE;
|
|
break;
|
|
/* PLL is selected as CK_SYS */
|
|
case SEL_PLL:
|
|
/* PLL clock source selection, HXTAL or IRC8M/2 */
|
|
pllsel = (RCU_CFG0 & RCU_CFG0_PLLSEL);
|
|
|
|
if(RCU_PLLSRC_HXTAL == pllsel) {
|
|
/* PLL clock source is HXTAL */
|
|
ck_src = HXTAL_VALUE;
|
|
|
|
predv0sel = (RCU_CFG1 & RCU_CFG1_PREDV0SEL);
|
|
/* source clock use PLL1 */
|
|
if(RCU_PREDV0SRC_CKPLL1 == predv0sel){
|
|
predv1 = (uint32_t)((RCU_CFG1 & RCU_CFG1_PREDV1) >> 4) + 1U;
|
|
pll1mf = (uint32_t)((RCU_CFG1 & RCU_CFG1_PLL1MF) >> 8) + 2U;
|
|
if(17U == pll1mf){
|
|
pll1mf = 20U;
|
|
}
|
|
ck_src = (ck_src / predv1) * pll1mf;
|
|
}
|
|
predv0 = (RCU_CFG1 & RCU_CFG1_PREDV0) + 1U;
|
|
ck_src /= predv0;
|
|
}else{
|
|
/* PLL clock source is IRC8M/2 */
|
|
ck_src = IRC8M_VALUE/2U;
|
|
}
|
|
|
|
/* PLL multiplication factor */
|
|
pllmf = GET_BITS(RCU_CFG0, 18, 21);
|
|
if((RCU_CFG0 & RCU_CFG0_PLLMF_4)){
|
|
pllmf |= 0x10U;
|
|
}
|
|
if(pllmf < 15U){
|
|
pllmf += 2U;
|
|
}else{
|
|
pllmf += 1U;
|
|
}
|
|
|
|
cksys_freq = ck_src * pllmf;
|
|
|
|
if(15U == pllmf){
|
|
/* PLL source clock multiply by 6.5 */
|
|
cksys_freq = ck_src * 6U + ck_src / 2U;
|
|
}
|
|
|
|
break;
|
|
/* IRC8M is selected as CK_SYS */
|
|
default:
|
|
cksys_freq = IRC8M_VALUE;
|
|
break;
|
|
}
|
|
|
|
/* calculate AHB clock frequency */
|
|
idx = GET_BITS(RCU_CFG0, 4, 7);
|
|
clk_exp = ahb_exp[idx];
|
|
ahb_freq = cksys_freq >> clk_exp;
|
|
|
|
/* calculate APB1 clock frequency */
|
|
idx = GET_BITS(RCU_CFG0, 8, 10);
|
|
clk_exp = apb1_exp[idx];
|
|
apb1_freq = ahb_freq >> clk_exp;
|
|
|
|
/* calculate APB2 clock frequency */
|
|
idx = GET_BITS(RCU_CFG0, 11, 13);
|
|
clk_exp = apb2_exp[idx];
|
|
apb2_freq = ahb_freq >> clk_exp;
|
|
|
|
/* return the clocks frequency */
|
|
switch(clock){
|
|
case CK_SYS:
|
|
ck_freq = cksys_freq;
|
|
break;
|
|
case CK_AHB:
|
|
ck_freq = ahb_freq;
|
|
break;
|
|
case CK_APB1:
|
|
ck_freq = apb1_freq;
|
|
break;
|
|
case CK_APB2:
|
|
ck_freq = apb2_freq;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ck_freq;
|
|
}
|